Do I cut back dahlias plants after flowering?

Here's a general guide for dahlias. It does depend on your hardiness zone so you might want to check that. You can search ' hardiness zone ' with your search engine, enter your zip code and find out your hardiness zone.

North east

I live in NE PA and they aren't hardy here. Ive been plating the big Dahlias to use for cut flowers. I wait until a good frost has blackened the stems, dig up and cut off all but 2 inches of stem, and store in peet moss in cardboard box in my basement. They don't all survive, but I've had pretty good luck.

If you want to store the bulbs for next year,dig them out and dry them,place in sphagnum peat's in a paper bag and store in a cool dark location

Yes. Cut the older blooms and you'll be rewarded with more new dahlia blooms.